In one of the rocks brought back from the Moon, it is found that 80.5% of the

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In one of the rocks brought back from the Moon, it is found that 80.5% of the initial potassium-40 in the rock has decayed to argon-40.

(a) If the half-life for this decay is 1.20 × 109 years, how old is the rock?

(b) How much longer will it take before only 10.0% of the original potassium-40 is still present in the rock?

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Physics

ISBN: 978-0321976444

5th edition

Authors: James S. Walker

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Question Posted: Aug 31, 2017 02:12 PM

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In one of the rocks brought back from the Moon, it is found that 80.5% of the

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Solve Equation 329 for the age of the rock where the decay constant is c...View the full answer

Physics

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